<style>
.welcome{
	position:absolute;
	top:40%;
	left:50%;
	-moz-transform:translate(-50%,-50%);
	transform:translate(-50%,-50%);
}
</style>
<h1 style="color:blue;margin-left:570px">欢迎使用知文招标网后台,请谨慎操作</h1>
<img class="welcome" src="../../front/images/28.jpg" style="width:300px"/>
